Mechanical time fuse



Jan. 12 1926.

O. JUNGHANS MECHANICAL TIME FUSE Filed June 27, 1925 lira/S 95/ far-n Patented Jan. 12, 1926.

UNITED STATES 'OSKAR JUNGHANS, OF SGHBAIBEBG, GERMANY.

MECHANICAL TIME FUSE.

Application filed June 27, 1925. Serial No. 40,058.

To all whom it may concern:

Be it known that I, OSKAR JUNGHANS, a citizen of the German Republic, residin at Schramberg, Gaishaldenstrasse 134, ermany, have invented certain new and useful Improvements in Mechanical Time Fuses, of which the following is a specification.

This invention relatestomechanical time fuses, particularly to such fuses of the Junghans type, in which the setting disk is caused to rotate by the goin train or clockwork after the projectile is red, and is set for the desired time of ignition before firing by means gf a rotar cap on, the fuse, a pin provided in the cap eing arranged to engage with a projection on the setting disk and to carry the latter around with it when the fuse cap is rotated. In fuses of this kind it has been found that the sudden acceleration of rotation that takes place immediate- 1 after the projectile is fired gives rise to a fbrce of inertia which has the tendency to displace both the setting disk and the fuse cap provided-with the setting pin in a direction opposite to the direction in which the said members are rotated when set, and this, of course, causes trouble and inaccuracies in firing.

The object of this invention is to remove these drawbacks and this is accomplished by provided means for locking both the setting disk and the fuse cap against rotation in the direction of the force of inertia that arises when the projectile leaves the gun. The locking means for the setting disk may consist of a plurality of spring detents which engage with the teeth of the ratchet-like periphery of the settin disk, whilst the locking means for the use cap consist in clamping or jamming rolls which prevent rotation of the cap in one direction, but allow it to rotate freely inthe other direction.

A constructional form of the invention is illustrated in the drawing.

Fig. 1 is a vertical section through the fuse. The going train which contains the core, and the parts associated with the clock work are shown herein in side elevation.

Fig. 2 is a horizontal section on the line .on the driving shaft of the clockwork so as 2 2 of Fig. 1. The core of the fuse with the setting disk and the locking member for the same are shown in plan view, while the lockin means for the 1 ition cap are shown at t e right side of this figure in plan view and at the left side partially in sec tion.

The general construction of the fuse is similar to fuses of the J unghans type. The setting disk at is mounted in a known manner to be carried round by friction. It can therefore be easily set for time without affecting the clockwork, but when the clockwork starts running after the projectile is fired from a cannon the disk is carried round by said shaft. The disk a is also provided in a known manner with a projection b which co-operates with a setting pin (1 fixed in the cap 0. Attached to the fixed core e of the fuse which contains the clockwork are a number of spring detents e which are irregularly distributed around the periphery and which engage in the saw-tooth periphery of the setting disk a. so as to permit the setting disk to rotate in the direction of the arrow shown in Fig. 2 but tolock the disk against rotation in the opposite direction in which the force of inertia acts when the projectile is fired.

To obviate unintentional rotation of the fuse cap 0 recesses f are provided in the part of the eriphery of the fuse body 9 that receives t e cap. These recesses form pockets which, when the cap 0 is in place, taper in the direction opposite to the direction in which the setting disk is set, i. e. the direction of the arrow in Fig. 2. In these pockets f are placed rolls 1:. which are urged towards the wedge-shaped end of the pocket 7 by means of pins Ia and springs 2', and by their own weight when the fuse is placed in a horizontal position. By this means the cap is free to move easily in the direction of the arrow (Fig- 2), i. e. in the direction in which the disk a is set, but it is locked against rotation in a clockwise direction, i. e. the direction in which the inertia is eifec tive.

Thearrangement of the locking member for the fuse cap offers the further advantage that all possibility of setting the fuse for time by turning the cap agalnst the direction of the arrow in Fig. 2 is precluded.

'I claim:

1. A mechanical time fuse for projectiles comprising a fuse body; a fuse having a clockwork mounted in said body; a setting disk for said clockwork and having a sawtooth periphery; a cap for said fuse body and having means thereon for setting said disk; and locking means engageable with said saw teeth of said disk in order to prevent the rotation of the disk in the opposite direction to that in which it is adapted to be set.

ing with said periphery and fixed relatively to thevdisk 3. Mechanical time fuse for projectiles comprising a driving mechanism with a shaft, a setting disk frictionally coupled to said shaft, a cap rotatable on the body of the fuse, a first locking mechanism for locking the setting disk against rotation in the direction in which a rotational force is im arted to it by inertia when the projectile is red from the gun, and a second locking mechanism for locking the cap a ainst rotation in the said direction, sald second locking mechanism comprising recesses 1n the body of the fuse bounded by. the internal 4 wall of the cap and tapering in the direction of rotation opposite to that in which the disk is turned when it is set, and jamming'rolls placed in said recesses.

4. Mechanical time fuse for projectiles comprising a driving mechanism with a shaft, a setting disk frictionally coupled to said shaft, a cap rotatable on the body of thefuse, a first locking mechanism for locking the setting disk against rotation in the direction in which a rotational force is imparted to-it by inertia when the projectile is fired from the gun, and a second ilocklng V mechanism for lockin the cap against rotation. in the said direction, said second locking mechanism comprising vrecess es in the body of the fuse bounded by the 1nternal wall of the cap and tapering in the direction of rotation opposite to that 1n which parted to it by inertia when the the disk is turned when it is set, jamming said shaft, a'cap rotatable on the body of the fuse, a first locking mechanism for locking the setting disk against rotation in the direction in which a rotational force is improjectile is fired from the gun, and a second locking mechanism for locking the cap against rotation in the said direction, said second looking mechanism comprising recesses in the body of the fuse bounded by internal wall of the cap and tapering in the direction of rotation opposite to that in which the disk is turned when it is set, jamming rolls placed in said recesses, and springs'for ur ing the rolls in the direction of taper of said recesses. v 6. A mechanical time fuse for projectiles comprising a fuse body provided with a clockwork; a setting disk for said clockwork and having a saw-tooth periphery; means for. setting said disk; and locking means engageable with said saw-teeth of said disk in order to prevent the rotation of the disk in the opposlte direction to'that in which it is adapted to be set.

7. A mechamcal time fuse for projectiles comprising, a fuse body provided with a clockwor a setting disk for said clockwork and having a saw-tooth periphery; and

locking means engageable with sald sawteeth of said disk in order to prevent the rotation of the disk in the opposite direction to that in which it is adapted to be set. I

8. A mechanical time fuse for projec-' tiles comprising a fuse bod provided with a clockwork; a setting disk ii) and having a saw-tooth periphery; locking means engageable with said saw teeth of said disk in order to prevent the rotation of the disk in the'opp'osite direction to. that in'which it is adapted to be set; a cap for said fuse body; and means in said fuse body engageable with said cap for preventing rotation of the cap the rotation of the disk in 'the opposite di-- rection to that in which it is adapted to be in the direction in whichthe inertia is effective when the'projectile is r said clockwork set; and meansin said fuse body engageable Lemme with said cap for preventing rotation of the cap inthe direction in which the inertia is effective when the projectile is fired.

10. A mechanical time fuse for projec- 6 tiles comprising a fuse body provided with a clockwork; a setting disk for said clockwork and having a saw-tooth periphery; locking means engageable with Jai said disk in order to prevent the rotation of the disk in the opposite direction to that saw-teeth of OSKAR JUN GHAN S. 

